Hi I have noticed that a lot of you are printing all of your study units out. Which is fine if you prefer paper to read. If however you are just wanting to have a copy of them you can save them PDF onto your device.
When you are on the study unit PDF click on the computer icon on the upper right. It will pop up a print page. Here you enter the page numbers 1-whichever is the last for that unit. Press print and on the next screen right at the top mid left it says save. When you click that you can Name, position into certain files as with all documents. I hope this helps with you!